I have also tested the service and really like their service. i have also bookmarked the site, in case i would be needing to swap the coins, i will prefer eXch.
However, there is one question in my mind after my recent bitcoin to XMR swap. I send the bitcoin to the eXch.cx address and it took a few blocks until my transaction was confirmed. (These days the mempool fees are quite high) and my order was executed.
In case, we send Bitcoin to them with less fee, how long the order will remain active and wait for the confirmations? Is there any limit to this or the order will remain active to receive confirmation of the transaction even if it takes few days?